<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>系统对话框</title>
  <script>
    console.log(1);
    // 警告弹框
    // alert(111)
    // 确认弹框
    // var result = confirm('是否确认删除')
    // 会话框
    var result = prompt('请输入姓名');
    console.log(result);
  </script>
</head>
<body>
  
</body>
</html>